Based on 1974's 2.2-litre Carrera RSR Turbo, the 935 initially weighed in at 880kg, a full 90kg under the minimum weight limit. This allowed Porsche to strategically position ballast and attain a perfect 40/60 front/rear distribution. Using the RSR Turbo's Bilstein gas damper suspension, cockpit adjustable rear anti-roll bar and 917-derived four-pot caliper brakes, the 935's wheels were 10.5 and 15-inches wide at the front/rear respectively and shod with Dunlop tyres. A new engine and gearbox were installed, the 2.8-litre turbocharged motor designated Typ 930/72 featuring ultra exotic componentry throughout. Just about the only parts it shared with the production 930 were the standard crankcase and crankshaft, everything else having been specially developed. To participate in the 4-litre swept volume regulations, Porsche’s were limited to a displacement of 2856cc which they achieved thanks to a bore and stroke of 92.4mm x 70.4mm. This equated to exactly 3999cc when taking into account the solitary KKK turbocharger. Adjustable from within the cockpit, turbo boost could be varied from 1.2 to 1.5 bar of pressure, this providing between 550 and 650bhp. Compression was set at 6.5:1, an uprated twin plug ignition fitted and titanium connecting rods and driveshafts used. Transmission was the 934 four-speed.